Steam-valve.



2 7%; w by G. H. McGUTGHBON.

STEAM VALVE.- APPLICATION 311m; AUG. 6, 1906.

915,467." Patented Mar. 16, 1909.

. v s wi/neasea 27 IO lnuenl'or THE NORRIS PETERS co, wAsnmaraN. n. c.

CHARLES McCUTOHEO N, OF BUFFALO, NEW YORK.

' STEAM-VALVE.

Specification of Letters Patent. Patented March 16, 1909.

Application filed August 6,1906. Serial N 0.329380.

To all whom it may concern:

Be it known that I, CHARLES H. Mo- OUTcHEoN, citizen of the UnitedStates, residing at Bufialo, inthe county of Erie and State of New York,have invented certain new and useful Improvements in Steam-Valves; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to figures of reference markedthereon, which form a part of this specification.

My invention relates to improvements in steam valves and moreparticularly to that type specially designed for operating boat, factoryand other whistles.

The object of my invention is to reduce the necessary pressure on theoperating lever or wheel, to a minimum.

To that end my invention consists of certain details of construction,all of which will be fully hereinafter described and claimed.

The figure of the drawing is a central longitudinal section of myimproved steam valve.

Referring to the drawing, 1 is the valve casing with main steam-chamberdivided into the compartments 2 and 3, by the partition-wall 4, rovidedwith the valve-seat 5. The inlet-ori ce 6 opens into the compartment 2and the outlet-orifice 7 opens into the compartment 3 of the mainsteam-chamber. The main piston-valve 8 has its forward concave end 9fitting snugly within the cylindrical auxiliary steam-chamber 10, itsrear end 11 being adapted for opening and closing engagement with thevalve-seat 5 in the partition-wall 4. The piston-rod 12 of the mainvalve 8 is seated and reciprocates within the cylindrical chamber 13,its outer projecting end being provided with the vertical socket 14,adapted for the loose reception of the short arm 15 of the operatinglever 16, pivoted at 17 in the goose-neck 18, held rigid upon the valvecasing, by the tightening-nut 19. Centrally located in the concave innerend 9 of the main valve 8 is the valve-seat 20 and 21 is the auxiliaryvalve fitted to the seat 20. The auxiliary piston-rod 22 of valve 20 isreciprocated within the central cylindrical chamber 23 of the piston-rod12, its inner end 24 projecting into the vertical socket 14 of thepiston-rod 12, when the valve 21 is in closed position, as shown in thedrawing.

This valve 21 is held normally closed by the spiral spring 25, one endof which encircles t e pin 26, integral with valve 21, its other endresting loosely within the socket 27, in the outer end wall of theauxiliary steamchamber 10. Annular packing-grooves 28, 28, in thecylindrical chamber 13 and similar grooves 29, 29 and 30, 30, in thepiston-rods 12 and 22, serve to prevent the escape and waste of steam.

In operation, when the lever 16 is depressed, its short arm 15 is firstthrown into contact with the cprojecting end 24 of the'auxiliarypiston-r0 22, which causes the auxiliary valve 21 to recede from itsvalve-seat 20, thus throwing the auxiliary steam-chamber 10 intocommunication with the compartment 3 of the main steam-chamber. As themovement of the short arm 15, of lever 16, is continued, it moves themain piston-rod 12, which causes the main valve 8 to recede from itsseat 5. The admitted steam then rushes into the compartment 3 of themain steamchamber and through the main valve 8, into the auxiliarysteam-chamber 10, thus instantly effecting a perfect steam balance onboth sides of the main valve 8. In this manner, a very slight pressureof the lever 16 is required to operate the valve.

While specially designed to operate steam whistles, my improvedconstruction is equally effective as a throttle-valve.

I claim.

1. The combination of avalve-case having inlet and outlet chambers, apassage connecting the same and an auxiliary chamber arranged withinsaid inlet-chamber, a main valve controlling said passage and fitted insaid auxiliary chamber, said valve having a relief-passage connectingthe auxiliary chamber with the outlet-chamber of the case and a hollowstem extending through the wall of the case, a relief-valve of smallerdiameter than the main valve arranged in the auxiliary chambercontrolling said relief-passage and having a stem arranged in the stemof the main valve, and a common operating device for said stems arrangedto act upon the reliefvalve stem in advance of the main-valve stem,substantially as set forth.

2. The combination of a valve-case having inlet and outlet chambers, apassage connecting the same and an auxiliary chamber arranged withinsaid inlet-chamber, a main valve controlling said passage and fitted insaid auxiliary chamber, said valve having a relief-passage connectingthe auxiliary cham- In testimony whereof, I have signed my her with theoutlet-chamber, a relief-Valve of name to this specification, in thepresence of smaller diameter than the main valve contwo subscribingwitnesses.

trolling said reliefassage, and a springar-r 1 r 7 CHARLES H.MoCUTCI-IEON. 5 ranged in the auXi iary chamber for closing Witnesses:

the relief-valve, andlmeans for opening said W. T. MILLER,

valves, substantially as set forth. 7 w l GEO. H. FISHER.

